The Princess Diner, near the intersection where Route 27 makes a perpendicular turn, is the real thing, with a huge menu and friendly service. Its facade is an Art Deco gem. There are 15 different omelettes and burgers, about 20 salads, and everything from Greek specialties to lamb chops and T-bone steak. Except for some of the entrees, the prices are as low as they get.